Package Exports

compute-median

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Readme

Median

Computes the median of a numeric array.

Installation

$ npm install compute-median

For use in the browser, use browserify.

Usage

To use the module,

var median = require( 'compute-median' );

median( arr[, sorted] )

Computes the median of a numeric array. If the input array is already sorted in ascending order, set the sorted flag to true.

var unsorted = [ 5, 3, 2, 4 ],
    sorted = [ 2, 3, 4, 5 ];

var m1 = median( unsorted );
// returns 3.5

var m2 = median( sorted, true );
// returns 3.5

Examples

var data = new Array( 1001 );

for ( var i = 0; i < data.length; i++ ) {
    data[ i ] = Math.round( Math.random() * 100 );
}

console.log( median( data ) );

To run the example code from the top-level application directory,

$ node ./examples/index.js

Notes

If provided an unsorted input array, the function is O( N log(N) ), where N is the array length. If the array is already sorted in ascending order, the function is O(1).

Tests

Unit

Unit tests use the Mocha test framework with Chai assertions. To run the tests, execute the following command in the top-level application directory:

$ make test

All new feature development should have corresponding unit tests to validate correct functionality.

Test Coverage

This repository uses Istanbul as its code coverage tool. To generate a test coverage report, execute the following command in the top-level application directory:

$ make test-cov

Istanbul creates a ./reports/coverage directory. To access an HTML version of the report,

$ make view-cov

License

MIT license.

compute-median